docs: def save_riskmodel(self):
          """
          Save the risk models in the datastore
          """
          self.datastore['risk_model'] = rm = self.riskmodel
          self.datastore['taxonomy_mapping'] = self.riskmodel.tmap
          attrs = self.datastore.getitem('risk_model').attrs
          attrs['min_iml'] = hdf5.array_of_vstr(sorted(rm.min_iml.items()))
          self.datastore.set_nbytes('risk_model')